package com.jkhan.design;

/**
 * @ClassName Singleton_05
 * @Description 双重锁校验（线程安全）
 * 双᯿锁的⽅式是⽅法级锁的优化，减少了部分获取实例的耗时。
 * 同时这种⽅式也满⾜了懒加载。
 * @Author hjk
 * @Date 2023/1/29 22:32
 **/
public class Singleton_05 {

    private static Singleton_05 instance;

    private Singleton_05() {
    }

    public static Singleton_05 getInstance() {
        if (null != instance) {
            return instance;
        }
        synchronized (Singleton_05.class) {
            if (null == instance) {
                instance = new Singleton_05();
            }
        }
        return instance;
    }

}
